QSBS Section 1202 Tax Guide 2026: $10M/$15M Gain Exclusion

Section 1202 QSBS is one of the most powerful and underutilized tax provisions for startup founders, angel investors, and early-stage employees. Originally offering a 50% exclusion, the Small Business Jobs Act of 2010 increased it to 100% for shares acquired after September 27, 2010, and the 2025 OBBBA added a tiered exclusion and a $15 million cap for stock issued after July 4, 2025 — meaning qualifying startup investors can pay $0 federal capital gains tax on gains up to the applicable cap ($10 million or $15 million) or 10x their basis. Understanding the eligibility requirements, planning opportunities, and state tax treatment is essential for anyone holding startup equity.

QSBS Eligibility Requirements in Detail

All of the following requirements must be met for stock to qualify as QSBS:

1. C-Corporation Requirement

The issuing entity must be a domestic C-corporation at the time of stock issuance and during substantially all of your holding period. Excluded industries: professional services (finance, law, health, consulting), hospitality, arts/entertainment, financial services, and farming. Technology companies, manufacturing, retail (with exceptions), and most other industries qualify. Note: Startups organized as LLCs (a common early-stage choice for flexibility) must convert to C-corporations before issuing QSBS-eligible shares. Many tech startups incorporate in Delaware as C-corps specifically to enable QSBS from day one.

2. Asset Test ($75 Million)

Gross assets (not net assets — gross) must be $75 million or less ($50 million for stock issued on or before July 4, 2025) immediately before and after the stock issuance. This test applies share-by-share: if the company issues shares when assets are $30M, those shares qualify. If the same company later grows to $100M in assets and issues new shares, those new shares do NOT qualify. Previously-qualified shares retain their QSBS status even if the company later exceeds $50M. For Series A and seed stage companies, this test is usually easy to meet. For late-stage companies with significant funding, verify the asset test at each funding round.

3. Original Issuance (Direct from Company)

QSBS must be acquired from the company directly — not purchased from another shareholder on the secondary market. This means: founder shares (issued at formation), employee stock options (shares issued at exercise are QSBS), angel investment rounds (direct equity investment), Series A/B/C preferred shares (if company is still under $50M). Secondary purchases from other investors do NOT qualify for QSBS treatment. However, gifted QSBS shares retain their QSBS status in the hands of the recipient (subject to holding period tacking).

4. The 5-Year Holding Requirement

Stock issued after July 4, 2025 can qualify for a partial exclusion after 3 years (50%) and 4 years (75%), with the full 100% at 5 years; earlier stock must be held MORE than five years. The clock starts on the issuance date — for option holders, this is the exercise date, not the grant date. For founders who receive shares at incorporation, the clock may already be running for years by exit. Note: the 5-year clock does NOT restart when options vest — if an employee receives options with a 4-year vest and exercises on day one (early exercise), the 5-year QSBS clock begins at exercise. This is why early exercise is particularly valuable for QSBS planning: it starts the 5-year clock earlier.

5. Active Business Requirement

At least 80% of the company's assets must be used in the active conduct of a qualified trade or business. The definition of 'qualified' excludes: financial services, banking, insurance, leasing, investment, farming, mining, hotels, restaurants, and professional services (law, health, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services). Most technology, software, hardware, and biotech companies qualify.

The Per-Issuer Per-Taxpayer Limit

The exclusion cap ($15M for stock issued after July 4, 2025; $10M for earlier stock) applies per company per taxpayer. Spouses filing separate returns each get half the cap (§1202(b)(3)); couples often plan around this with gifts and separate holdings, which needs professional advice. For large positions, the 10x basis alternative provides a higher exclusion if your original basis is more than one-tenth of the cap: $5M invested in QSBS with a $100M exit → 10x basis = $50M exclusion (use the 10x rule instead of the flat cap).

QSBS Stacking, State Tax, and Planning Strategies

Advanced QSBS strategies can multiply the benefit:

QSBS Stacking

Stacking involves transferring QSBS shares to multiple taxpayers to multiply the per-taxpayer exclusion. Methods: gifts to family members (each donee has their own cap, holding period tacks from donor), transfers to trusts (each separate trust is a separate taxpayer with its own cap), partnerships (each partner has their own cap on their share of qualifying gain). Example: Founder holds $50M in QSBS gain. Solo: the exclusion is capped ($10M for pre-July 5, 2025 stock; $15M for later stock) unless 10x basis is higher. With stacking to 5 separate taxpayers: potentially up to five times the cap. Note: IRS scrutiny of aggressive stacking is increasing. Structures must have legitimate non-tax purposes. Consult a QSBS specialist before attempting complex stacking arrangements.

1202 Rollover (Section 1045)

If QSBS is sold before the 5-year mark: Section 1045 allows a rollover into new QSBS within 60 days, preserving the gain deferral. The holding period of the sold stock generally tacks onto the replacement stock (IRC §1223(13)), so the clock does not restart; the stock sold must have been held more than six months. This can be valuable for founders who need liquidity before 5 years but want to preserve QSBS treatment.

State Tax on QSBS Gains

The federal exclusion is significant, but most high-tax states do NOT conform:

QSBS + Residency Planning

For California founders planning an exit: changing domicile to Texas or Florida before the QSBS sale is a legal strategy to avoid California's ~13.3% state tax. Key rules: California will assert tax on QSBS gains if you are a California resident at the time of sale, even if the company was founded in California. A genuine domicile change (break CA ties, establish FL/TX domicile) before the sale eliminates CA tax on the gain. California has no exit tax, but the Franchise Tax Board scrutinises domicile changes, so documentation matters (see Moving From California Tax Guide). Some founders change domicile specifically before a QSBS exit to capture full state-level savings on a once-in-a-career gain event.